Horseshoe crabs, or Limulus polyphemus, are very common along the east coast of the US. Fossils of horseshoe crabs have revealed that they have changed very little in the past 300 million years. Which statement best explains why this is the case?

A.Horseshoe crabs have a low reproductive rate.

B.Horseshoe crabs need to change only if humans are present in their environment.

C.The horseshoe crab is well adapted to its environment. and its environment has not changed much in the last 300 million years.

D.Horseshoe crabs have a high mutation rate.

Answer:

Explanation:

Maybe because people call babies cute and youd bassically be saying theyre babies

Answer: Angle of Incidence is not equal to refraction 

Explanation: It’s not because a refracted ray depends on how dense is the substance.

Answer:

A I think

Explanation:

at the wrist lightly press the index and the middle fingers of one hand on the opposite wrist just below the base of the thumb at the neck lightly press the side of the neck just below the jawbone count the number of beats in 15 seconds and multiply by four and that's your heart rate

You can take your heart rate using both the Radial Pulse Point and the Carotid Point. The correct answer is "A and B."

1. Radial Pulse Point: The radial pulse is taken by placing two fingers (usually the index and middle fingers) on the radial artery, which is located on the wrist, on the same side as the thumb. By feeling the pulsations, you can count the number of beats per minute, which gives you the heart rate.

2. Carotid Point: The carotid pulse is taken by placing two fingers (usually the index and middle fingers) on the carotid artery, which is located on either side of the neck, just below the jawline. Again, you can count the number of beats per minute to determine the heart rate.

Both methods are commonly used to measure heart rate, and they are easy to access and provide accurate results. However, it's essential to be gentle when taking a pulse to avoid putting excessive pressure on the arteries.

To know more about heart rate:

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Answer: 4

Explanation:

The answer to this question is number 4 as part 4 is where the roller coaster is slowing down. This means that it is gaining stored potential energy and in turn, losing kinetic energy. Furthermore, an object gains potential energy as it goes higher, usually.

Answer:

In wind turbines, the blades rotate due to the wind.

Explanation:

In wind turbines, the blades rotate due to the wind. While the blade rotates the generator connected to it also rotates. Thus the kinetic energy from the wind initiates the electric generator which in turn produces the electricity.

Thus the kinetic energy of the wind is converted to electricity.

Hope this helps!

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